param(
    [Parameter(Mandatory=$true)]
    [string]$url
)

function Write-Log($msg)
{
    Write-Host $msg -foregroundcolor green
    #($msg) | Out-File "change-site-collection-admins.txt" -Append
}


$wa = Get-SPWebApplication $url
foreach ($site in $wa.Sites)
{
    Write-Log $site.Url
    try
    {
        Set-SPSite $site.Url -OwnerAlias "i:0#.w|howzee\alex" -SecondaryOwnerAlias "i:0#.w|howzee\admitriev"
    }
    catch
    {
        Write-Log "Retry..."
        Start-Sleep -Seconds 2
        Set-SPSite $site.Url -OwnerAlias "i:0#.w|howzee\alex" -SecondaryOwnerAlias "i:0#.w|howzee\admitriev"
    }
}
#$site = Get-SPSite $url
#Set-SPSite $site.Url -OwnerAlias "howzee\alex" -SecondaryOwnerAlias "howzee\admitriev"